I assume you want a rectange of dimensions 68 times (unknown). Here is how you solve it.
1) Look up the definition of "acre"; specifically, how many square feet does an acre have (unless you have already memorized it, of course).
2) Convert the half-acre to square feet.
3) Divide the number of square feet by 68 feet to get the unknown other length.
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43,560 square feet equals one acre.
43,560 square feet in an acre
43.56
To calculate the number of 25 by 100 feet lots needed to make an acre, we first convert an acre to square feet, which is 43,560 square feet. Then, we divide the total square footage of an acre by the area of one lot (25 feet by 100 feet = 2,500 square feet) to find the number of lots. Therefore, 43,560 square feet divided by 2,500 square feet equals 17.424. This means you would need 18 lots of 25 by 100 feet to make an acre, with a small remainder.
An acre is a measure of area with no defined shape. You can make it as long as you like if it is also made correspondingly thinner.